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Plants have specialized organs for distinct functions. Leaves perform photosynthesis and fix carbon, whereas roots absorb water and minerals. To distribute resources between these organs, plants have a vasculature composed of phloem and xylem. The xylem conducts water and minerals from the roots up to the shoots. The phloem transports carbon-and(More)
In most plants, sucrose is exported from source leaves to carbon-importing sink tissues to sustain their growth and metabolism. Apoplastic phloem-loading species require sucrose transporters (SUTs) to transport sucrose into the phloem. In many dicot plants, genetic and biochemical evidence has established that SUT1-type proteins function in phloem loading.(More)
Whole-plant carbohydrate partitioning involves the assimilation of carbon in leaves and its translocation to nonphotosynthetic tissues. This process is fundamental to plant growth and development, but its regulation is poorly understood. To identify genes controlling carbohydrate partitioning, we isolated mutants that are defective in exporting fixed carbon(More)
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